practice is all you can do to improve and a lot of it
specific suggestions - & sorry if any of it seems harsh, this is just constructive criticism
- the coloring seems like barely any effort was put into it, i suggest coloring in more lightly and try coloring it the whole thing i.e. the skirt. coloring lightly makes shading/layers show better
- take your time throughout the whole drawing, it'll look so much better if you do
- the anatomy needs work (ex: the legs and thighs should curve inwards towards the knee caps and the elbows need more definition
- i recommend working on the fingers, dont make them too close to the wrist bc then it'll just look like there's no actual hand there
- im assuming the pink thing is a scarf. if it is, have it rest on the shoulders more and make it look like theres some hanging off the back - at least that's how i would do it
- the line art should be cleaner imo and more 'straight'